What is the Difference Between DALI and DMX512?

DMX512 supports one-way communication. DALI supports two-way communication.
DMX512 protocol is simple. DALI protocol is complicated. DALI has more than 200 protocols. Different LED lamps need special extended protocols.
DMX512 adopts RS485 communication bus. DALI adopts low voltage power-line communication bus which provides maximum current 250ma for DALI devices.
DMX512 baud rate is 250K bit/s. DALI baud rate is 1200bit/s.
DMX512 adopts a single master and multi-salvers, which can connect 512 multi-salves. DALI also adopts a single master and multi-salvers which can connect 64 multi-salves.
DMX512 address can be set to manual mode. DALI address can be set to manual mode or master assigned automatically.
DMX512 sets groups according to the master. DALI sets 16 groups at most.
DMX512 sets scenes according to the master. DALI sets 16 scenes at most.
DMX512 and DALI are widely used in many applications. If you want to know more. Welcome to visit our website: www.euchips.com

DALI Dimmable LED Driver has a Chance to Enter Taiwan Market

It is learnt that the government approved the “Mercury streetlight sunset plan” which has been expected to invest NT$ 5.49 billion yuan (about 178.44 million US dollars) in the next two years in Taiwan, aim to assist local governments on replacing 692,000 units mercury street lights by LED street lights in the end of 2016. Will DALIdimmable led driver have a chance to enter Taiwan market.

After the completion of replacement, Taiwan will become the world’s first region which eliminates mercury lights comprehensively. It is expected to save up to 640 million Kwh annually, will reduce NT$ 1.1 billion yuan (about 35.75 million US dollars) electricity cost and NT$ 346 million yuan (about 11.24 million US dollars) maintenance costs, the local government expenditure can save up to NT$ 7.23 billion yuan (about 235 million US dollars) in five years. If it is stalled DALI dimmable led driver, what will happen? As we all know, DALI dimmable led driver is the help of secondary energy conversation. What is more, DALI dimmable led driver can control every led lamp easily. You can establish some groups of led lamps, and then instanll DALI dimmable led driver to control every lamp. DALI dimmable led driver can dim the brightness of lamps, which creates a comfortable, colorful and beautiful lighting. It is also a beautiful view of the city.

We hope that the government will finish Mercury streetlight sunset plan” well. Meanwhile, DALI dimmable led driver will have a bright future in Taiwan Market. Let’ s wait and see.

Digital Addressable Lighting Interface

IEC 60929 and IEC 62386 are technical standards for network-based systems that control lighting in building automation. They were established as a successor for 0-10 V lighting control systems, and as an open standard alternative to Digital Signal Interface (DSI), on which it is based. IEC 60929 is the first version of the standard and will be withdrawn by 23 June 2014. Members of the AG DALI are allowed to use the Digital Addressable Lighting Interface (DALI) trademark on devices that are compliant with the current standard. Non AG DALI members can apply for a fee bearing license. It was founded by Philips lighting in 1984.
DALI (Digital Addressable Lighting Interface) is a data protocol and transport mechanism that was jointly developed and specified by several manufacturers of lighting equipment. The common platform of DALI enables equipment from different manufacturers to be connected together.

DALI network consists of a controller and one or more lighting devices (e.g., electrical ballasts and dimmers) that have DALI interfaces. The controller can monitor and control each light by means of a bi-directional data exchange. The DALI protocol permits devices to be individually addressed and it also incorporates Group and Scene broadcast messages to simultaneously address multiple devices (e.g., "Group 1 goto 100%" or "Recall Scene 1").

Each lighting device is assigned a unique static address in the numeric range 0 to 63, making possible up to 64 devices in a standalone system. Alternatively, DALI can be used as a subsystem via DALI gateways to address more than 64 devices. Data is transferred between controller and devices by means of an asynchronous, half-duplex, serial protocol over a two-wire bus, with a fixed data transfer rate of 1200 bit/s.

DALI requires a single pair of wires to form the bus for communication to all devices on a single DALI network. The network can be arranged in a bus or star topology, or a combination of these. The DALI System is not classified as SELV (Separated Extra Low Voltage) and therefore may be run next to the mains cables or within a multi-core cable that includes mains power. The DALI data is transmitted using manchester encoding and has a high signal to noise ratio which enables reliable communications in the presence of a large amount of electrical noise. DALI employs a diode bridge in the interface circuitry so that devices can be wired without regard for polarity. Signal level are defined as 0±4.5 V for "0" and 16±6.5 V for "1". Central interface power maximum is 250 mA and 2 mA per unit. The network cable is required to be mains-rated, with 600 V isolation and at least a 1 mm cross-section, with a maximum drop of 2 volts along the cable (max 300 m). Signal interface is galvanically separated and doesn't need any termination resistors. DALI is a step on from the DSI protocol, which is used by HF fluorescent ballasts. One of the main advantages that DALI has over earlier systems is that each device on a segment of data cable can be separately addressed, as DSI and 1-10V devices are not separately addressable and can only be controlled as a group. The net result is that to achieve similar control functionally, DALI requires less complex (and therefore less expensive) wiring topology than DSI or 1-10V devices.